Abstract

Introduction of the clonedErwinia chrysanthemi pelB orpelE genes intoEscherichia coli enabled the latter to cause blackleg disease symptoms in potato similar to those observed with the pathogenErwinia carotovora. TheE. coli cells multiplied in the roots and moved systemically in the potato stems, concomitant with the appearance of disease symptoms.E. coli cells expressing the clonedpel genes also interacted with the fungal pathogen,Verticillium dahliae, as observed previously withErwinia spp. The results indicate that either of two clonedpel genes permitsE. coli to cause relatively sophisticated diseases in potato plantlets.

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